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===About Igneous Rocks===
: When [[magma]] or [[lava]] [[freezing|freezes]] it is called an '''igneous''' rock.
: When the [[magma]] is trapped underground it [[freezing|freezes]] slowly and this makes very large [[crystal]]s in the rock. This is called [['intrustive]] rock'.: When the [[lava]] comes out of the [[volcano]] it cools down and [[freezing|freezes]] quickly making small [[crystal]]s. This is called [['extrusive]] rock'.
: [[Igneous]] rocks have sharp interlocking [[Grain (Rock)|grains]].